Interrupted Aortic Arch

Chest radiographs usually show cardiac dilation and pulmonary congestion similar to
that seen in hypoplastic left ventricle. Interrupted aortic arch and truncus arteriosus
are common findings in the Di George syndrome, a pure type of T-cell deficiency with
absence or hypoplasia of the thymus and the parathyroid glands, as a result of failure of
development of the third and fourth brachial arches. Neonatal tetany is usually the first
clinical indication of this abnormality.